Center-draft bell-bottom base-burner heating-stove



' (No Model.)

I E. B. THOMAS.

CENTER DRAFT BELL BOTTOM BASE BURNER HEATING STOVE. No. 392,894.Patented Nov. 13, 11888.

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UNITED STATES PATENT @EErcE.

CENTER-D RAFT BELL-BOTTOM BASE-BURNER HEATING-STOVE.

SPECIFICATION forming part of Letters Patent No. 392,894, dated November13, 1883.

Application filed November 22, 1857. Serial No. 255,935. (No model.)

To all whom it, may concern.-

Be it known that I, EDWARD B. Thomas, a citizen of the United States,residing in the city and county of San Francisco, and State ofCalifornia, have invented a new and useful Center-Draft Bell-BottomBase-Burner Heating-Stove, of which the following is a specification.

My invention relates to improvements in stoves, which will be understoodby reference to the accompanying drawings.

Figure 1 is a view of a stove embodying my improvements,thesaniebeingpartlyinvertical section and partly in elevation. Fig. 2 is asectional view taken on the line 00 :c, Fig. 1; and Fig. 3 is a view ofone of the ash-pans removed.

The followingis the construction of the same:

A represents a drum, composed of sh eet-iron,

. in appearance like the drum upon the top of a stove of ordinaryconstruction; B,the magazine,of cast-iron,with cover 0 of ordinaryconstruction; D, the outer case of the stove,made of such metal as theuse of the stove may require, either casting or sheet metal; E, thegrate, of casting, such as is usually employed in that class ofconstruction; F, the center cone-shaped chamber, generally of cast-iron;G, the smoke or draft pipe generally employed in heating; H,the upperconnectingpipe for connecting the pipe G with the drum A. I representsthe damper to open and close the circulation ordraft through theconnecting-pipe H when required. J represents the ash-pans, which are ofa semicircular form and supported upon the usual base-plate in theordinary manner. K represents the shaker. L represents thecold-air-supply pipes. M represents the damper in the pipe G.Grepresents the bellshaped outer shell or case-of the stove; H, the capof the pipeGto prevent the fuel from dropping into the same. 1?represents the dividing-bar which directs the ashes into the ashpans.

The following is the operation ofmy improvements in stoves: The-fuel isplaced upon the grate around the cone-shaped chamber,and the current ofair arising through the fuel or grate passes up to the top of the conewithin the fire-chamber and is drawn down through the pipe G. Thus, inaddition to the reverberatory effect produced, an increase ofheating-surface is secured equal to the surfaces of the cone-shapedchamber F and pipe G.

It should be observed that the chamber F, which I have here illustratedas of a truncated conical form, is closed at its upper end, or, in otherwords, has no communication with the fire-chamber. Thecold-airpipesLaredesigned to conduct cold air into this chamber F and discharge withinthe same, near the upper portion thereof, the air thus introduced comingin contact with the heated walls of the said chamber and also thedraft-flue G, as well as intermingling with the radiated heat from both,after which by the fresh supply of cold air a draft is caused, whichforces the heated air down within the conical-formed chamber, where itis discharged into the room where the stove is located.

I have found that the cold-airpipes may in some cases be dispensedwith,and when an oblong or oval chamber has been employed and suchchambers multiplied a very good result is had; but I prefer to use thecold-air tubes, as I have found by experience that a better re sult isaccomplished by the employment of such.

In placing the fuel in the stove it is fed through the feed-pipe B. Thedamper I being open and the damper M closed, the direct upward draft isthus established. As soon as the fire is properly burning, the damper Mis opened and the damper I closed. The current of hot air is thuscarried down through the pipe G, allowing the heat to radiate from thepipe G and the cone-shaped chamber F. The increase of heating-surface,inaddition to the air-supply from the pipes L, more than doubles theheating effect with the same amount of fuel.

I do not desire to confine myself to a conical form central chamber, asthe same principle of invention may be carried out by constructing thechamber in an oblong or oval form or with an under hotair chamber of anydescription where the central downward draft is socured and thereverberatory effect described is produced.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s-

1. In a stove, the combination of the central cone-shaped chamber, thesmoke or draft pipe having one end arranged within the said chamber, thecap on the said pipe above the chamher, and the cold-air pipes havingone end opening within the chamberand the opposite end opening beneaththe stove, substantially as specified.

2. In a stove, the combination of the coneshaped chamber arrangedtherein, the draftpipe G, having one end passing upwardly through thechamber and provided with a cap, H, the pipe H, connecting the upperportion of the stove-body with the draftpipe and having a damper, as I,and the damper M in the said draftpipe below the point of connection ofthe pipe H, all substantially as specified.

EDWARD B. THOMAS.

Witnesses:

JOHN H. REDSTONE, L. E. REDSTONE.

